// Copyright GoFrame Author(https://goframe.org). All Rights Reserved. // // This Source Code Form is subject to the terms of the MIT License. // If a copy of the MIT was not distributed with this file, // You can obtain one at https://github.com/gogf/gf. // Package gdb provides ORM features for popular relationship databases. package gdb import ( "context" "database/sql" "fmt" "time" "github.com/gogf/gf/v2/container/garray" "github.com/gogf/gf/v2/container/gmap" "github.com/gogf/gf/v2/container/gtype" "github.com/gogf/gf/v2/container/gvar" "github.com/gogf/gf/v2/errors/gcode" "github.com/gogf/gf/v2/errors/gerror" "github.com/gogf/gf/v2/os/gcache" "github.com/gogf/gf/v2/os/gcmd" "github.com/gogf/gf/v2/os/gctx" "github.com/gogf/gf/v2/os/glog" "github.com/gogf/gf/v2/util/grand" "github.com/gogf/gf/v2/util/gutil" ) // DB defines the interfaces for ORM operations. type DB interface { // =========================================================================== // Model creation. // =========================================================================== // Model creates and returns a new ORM model from given schema. // The parameter `table` can be more than one table names, and also alias name, like: // 1. Model names: // Model("user") // Model("user u") // Model("user, user_detail") // Model("user u, user_detail ud") // 2. Model name with alias: Model("user", "u") // Also see Core.Model. Model(tableNameOrStruct ...interface{}) *Model // Raw creates and returns a model based on a raw sql not a table. Raw(rawSql string, args ...interface{}) *Model // Schema creates and returns a schema. // Also see Core.Schema. Schema(schema string) *Schema // With creates and returns an ORM model based on metadata of given object. // Also see Core.With. With(objects ...interface{}) *Model // Open creates a raw connection object for database with given node configuration. // Note that it is not recommended using the function manually. // Also see DriverMysql.Open. Open(config *ConfigNode) (*sql.DB, error) // Ctx is a chaining function, which creates and returns a new DB that is a shallow copy // of current DB object and with given context in it. // Also see Core.Ctx. Ctx(ctx context.Context) DB // Close closes the database and prevents new queries from starting. // Close then waits for all queries that have started processing on the server // to finish. // // It is rare to Close a DB, as the DB handle is meant to be // long-lived and shared between many goroutines. Close(ctx context.Context) error // =========================================================================== // Query APIs. // =========================================================================== Query(ctx context.Context, sql string, args ...interface{}) (Result, error) // See Core.Query. Exec(ctx context.Context, sql string, args ...interface{}) (sql.Result, error) // See Core.Exec. Prepare(ctx context.Context, sql string, execOnMaster ...bool) (*Stmt, error) // See Core.Prepare. // =========================================================================== // Common APIs for CURD. // =========================================================================== Insert(ctx context.Context, table string, data interface{}, batch ...int) (sql.Result, error) // See Core.Insert. InsertIgnore(ctx context.Context, table string, data interface{}, batch ...int) (sql.Result, error) // See Core.InsertIgnore. InsertAndGetId(ctx context.Context, table string, data interface{}, batch ...int) (int64, error) // See Core.InsertAndGetId. Replace(ctx context.Context, table string, data interface{}, batch ...int) (sql.Result, error) // See Core.Replace. Save(ctx context.Context, table string, data interface{}, batch ...int) (sql.Result, error) // See Core.Save. Update(ctx context.Context, table string, data interface{}, condition interface{}, args ...interface{}) (sql.Result, error) // See Core.Update. Delete(ctx context.Context, table string, condition interface{}, args ...interface{}) (sql.Result, error) // See Core.Delete. // =========================================================================== // Internal APIs for CURD, which can be overwritten by custom CURD implements. // =========================================================================== DoSelect(ctx context.Context, link Link, sql string, args ...interface{}) (result Result, err error) // See Core.DoSelect. DoInsert(ctx context.Context, link Link, table string, data List, option DoInsertOption) (result sql.Result, err error) // See Core.DoInsert. DoUpdate(ctx context.Context, link Link, table string, data interface{}, condition string, args ...interface{}) (result sql.Result, err error) // See Core.DoUpdate. DoDelete(ctx context.Context, link Link, table string, condition string, args ...interface{}) (result sql.Result, err error) // See Core.DoDelete. DoQuery(ctx context.Context, link Link, sql string, args ...interface{}) (result Result, err error) // See Core.DoQuery. DoExec(ctx context.Context, link Link, sql string, args ...interface{}) (result sql.Result, err error) // See Core.DoExec. DoFilter(ctx context.Context, link Link, sql string, args []interface{}) (newSql string, newArgs []interface{}, err error) // See Core.DoFilter. DoCommit(ctx context.Context, in DoCommitInput) (out DoCommitOutput, err error) // See Core.DoCommit. DoPrepare(ctx context.Context, link Link, sql string) (*Stmt, error) // See Core.DoPrepare. // =========================================================================== // Query APIs for convenience purpose. // =========================================================================== GetAll(ctx context.Context, sql string, args ...interface{}) (Result, error) // See Core.GetAll. GetOne(ctx context.Context, sql string, args ...interface{}) (Record, error) // See Core.GetOne. GetValue(ctx context.Context, sql string, args ...interface{}) (Value, error) // See Core.GetValue. GetArray(ctx context.Context, sql string, args ...interface{}) ([]Value, error) // See Core.GetArray. GetCount(ctx context.Context, sql string, args ...interface{}) (int, error) // See Core.GetCount. GetScan(ctx context.Context, objPointer interface{}, sql string, args ...interface{}) error // See Core.GetScan. Union(unions ...*Model) *Model // See Core.Union. UnionAll(unions ...*Model) *Model // See Core.UnionAll. // =========================================================================== // Master/Slave specification support. // =========================================================================== Master(schema ...string) (*sql.DB, error) // See Core.Master. Slave(schema ...string) (*sql.DB, error) // See Core.Slave. // =========================================================================== // Ping-Pong. // =========================================================================== PingMaster() error // See Core.PingMaster. PingSlave() error // See Core.PingSlave. // =========================================================================== // Transaction. // =========================================================================== Begin(ctx context.Context) (TX, error) // See Core.Begin. Transaction(ctx context.Context, f func(ctx context.Context, tx TX) error) error // See Core.Transaction. // =========================================================================== // Configuration methods. // =========================================================================== GetCache() *gcache.Cache // See Core.GetCache. SetDebug(debug bool) // See Core.SetDebug. GetDebug() bool // See Core.GetDebug. GetSchema() string // See Core.GetSchema. GetPrefix() string // See Core.GetPrefix. GetGroup() string // See Core.GetGroup. SetDryRun(enabled bool) // See Core.SetDryRun. GetDryRun() bool // See Core.GetDryRun. SetLogger(logger glog.ILogger) // See Core.SetLogger. GetLogger() glog.ILogger // See Core.GetLogger. GetConfig() *ConfigNode // See Core.GetConfig. SetMaxIdleConnCount(n int) // See Core.SetMaxIdleConnCount. SetMaxOpenConnCount(n int) // See Core.SetMaxOpenConnCount. SetMaxConnLifeTime(d time.Duration) // See Core.SetMaxConnLifeTime. // =========================================================================== // Utility methods. // =========================================================================== GetCtx() context.Context // See Core.GetCtx. GetCore() *Core // See Core.GetCore GetChars() (charLeft string, charRight string) // See Core.GetChars. Tables(ctx context.Context, schema ...string) (tables []string, err error) // See Core.Tables. The driver must implement this function. TableFields(ctx context.Context, table string, schema ...string) (map[string]*TableField, error) // See Core.TableFields. The driver must implement this function. ConvertValueForField(ctx context.Context, fieldType string, fieldValue interface{}) (interface{}, error) // See Core.ConvertValueForField ConvertValueForLocal(ctx context.Context, fieldType string, fieldValue interface{}) (interface{}, error) // See Core.ConvertValueForLocal CheckLocalTypeForField(ctx context.Context, fieldType string, fieldValue interface{}) (LocalType, error) // See Core.CheckLocalTypeForField } // TX defines the interfaces for ORM transaction operations. type TX interface { Link Ctx(ctx context.Context) TX Raw(rawSql string, args ...interface{}) *Model Model(tableNameQueryOrStruct ...interface{}) *Model With(object interface{}) *Model // =========================================================================== // Nested transaction if necessary. // =========================================================================== Begin() error Commit() error Rollback() error Transaction(ctx context.Context, f func(ctx context.Context, tx TX) error) (err error) // =========================================================================== // Core method. // =========================================================================== Query(sql string, args ...interface{}) (result Result, err error) Exec(sql string, args ...interface{}) (sql.Result, error) Prepare(sql string) (*Stmt, error) // =========================================================================== // Query. // =========================================================================== GetAll(sql string, args ...interface{}) (Result, error) GetOne(sql string, args ...interface{}) (Record, error) GetStruct(obj interface{}, sql string, args ...interface{}) error GetStructs(objPointerSlice interface{}, sql string, args ...interface{}) error GetScan(pointer interface{}, sql string, args ...interface{}) error GetValue(sql string, args ...interface{}) (Value, error) GetCount(sql string, args ...interface{}) (int64, error) // =========================================================================== // CURD. // =========================================================================== Insert(table string, data interface{}, batch ...int) (sql.Result, error) InsertIgnore(table string, data interface{}, batch ...int) (sql.Result, error) InsertAndGetId(table string, data interface{}, batch ...int) (int64, error) Replace(table string, data interface{}, batch ...int) (sql.Result, error) Save(table string, data interface{}, batch ...int) (sql.Result, error) Update(table string, data interface{}, condition interface{}, args ...interface{}) (sql.Result, error) Delete(table string, condition interface{}, args ...interface{}) (sql.Result, error) // =========================================================================== // Utility methods. // =========================================================================== GetCtx() context.Context GetDB() DB GetSqlTX() *sql.Tx IsClosed() bool // =========================================================================== // Save point feature. // =========================================================================== SavePoint(point string) error RollbackTo(point string) error } // Core is the base struct for database management. type Core struct { db DB // DB interface object. ctx context.Context // Context for chaining operation only. Do not set a default value in Core initialization. group string // Configuration group name. schema string // Custom schema for this object. debug *gtype.Bool // Enable debug mode for the database, which can be changed in runtime. cache *gcache.Cache // Cache manager, SQL result cache only. links *gmap.StrAnyMap // links caches all created links by node. logger glog.ILogger // Logger for logging functionality. config *ConfigNode // Current config node. dynamicConfig dynamicConfig // Dynamic configurations, which can be changed in runtime. } type dynamicConfig struct { MaxIdleConnCount int MaxOpenConnCount int MaxConnLifeTime time.Duration } // DoCommitInput is the input parameters for function DoCommit. type DoCommitInput struct { Db *sql.DB Tx *sql.Tx Stmt *sql.Stmt Link Link Sql string Args []interface{} Type string IsTransaction bool } // DoCommitOutput is the output parameters for function DoCommit. type DoCommitOutput struct { Result sql.Result // Result is the result of exec statement. Records []Record // Records is the result of query statement. Stmt *Stmt // Stmt is the Statement object result for Prepare. Tx TX // Tx is the transaction object result for Begin. RawResult interface{} // RawResult is the underlying result, which might be sql.Result/*sql.Rows/*sql.Row. } // Driver is the interface for integrating sql drivers into package gdb. type Driver interface { // New creates and returns a database object for specified database server. New(core *Core, node *ConfigNode) (DB, error) } // Link is a common database function wrapper interface. // Note that, any operation using `Link` will have no SQL logging. type Link interface { QueryContext(ctx context.Context, sql string, args ...interface{}) (*sql.Rows, error) ExecContext(ctx context.Context, sql string, args ...interface{}) (sql.Result, error) PrepareContext(ctx context.Context, sql string) (*sql.Stmt, error) IsOnMaster() bool IsTransaction() bool } // Sql is the sql recording struct. type Sql struct { Sql string // SQL string(may contain reserved char '?'). Type string // SQL operation type. Args []interface{} // Arguments for this sql. Format string // Formatted sql which contains arguments in the sql. Error error // Execution result. Start int64 // Start execution timestamp in milliseconds. End int64 // End execution timestamp in milliseconds. Group string // Group is the group name of the configuration that the sql is executed from. Schema string // Schema is the schema name of the configuration that the sql is executed from. IsTransaction bool // IsTransaction marks whether this sql is executed in transaction. RowsAffected int64 // RowsAffected marks retrieved or affected number with current sql statement. } // DoInsertOption is the input struct for function DoInsert. type DoInsertOption struct { OnDuplicateStr string // Custom string for `on duplicated` statement. OnDuplicateMap map[string]interface{} // Custom key-value map from `OnDuplicateEx` function for `on duplicated` statement. InsertOption InsertOption // Insert operation in constant value. BatchCount int // Batch count for batch inserting. } // TableField is the struct for table field. type TableField struct { Index int // For ordering purpose as map is unordered. Name string // Field name. Type string // Field type. Eg: 'int(10) unsigned', 'varchar(64)'. Null bool // Field can be null or not. Key string // The index information(empty if it's not an index). Eg: PRI, MUL. Default interface{} // Default value for the field. Extra string // Extra information. Eg: auto_increment. Comment string // Field comment. } // Counter is the type for update count. type Counter struct { Field string Value float64 } type ( Raw string // Raw is a raw sql that will not be treated as argument but as a direct sql part. Value = *gvar.Var // Value is the field value type. Record map[string]Value // Record is the row record of the table. Result []Record // Result is the row record array. Map = map[string]interface{} // Map is alias of map[string]interface{}, which is the most common usage map type. List = []Map // List is type of map array. ) type CatchSQLManager struct { SQLArray *garray.StrArray DoCommit bool } const ( defaultModelSafe = false defaultCharset = `utf8` defaultProtocol = `tcp` unionTypeNormal = 0 unionTypeAll = 1 defaultMaxIdleConnCount = 10 // Max idle connection count in pool. defaultMaxOpenConnCount = 0 // Max open connection count in pool. Default is no limit. defaultMaxConnLifeTime = 30 * time.Second // Max lifetime for per connection in pool in seconds. ctxTimeoutTypeExec = 0 ctxTimeoutTypeQuery = 1 ctxTimeoutTypePrepare = 2 cachePrefixTableFields = `TableFields:` cachePrefixSelectCache = `SelectCache:` commandEnvKeyForDryRun = "gf.gdb.dryrun" modelForDaoSuffix = `ForDao` dbRoleSlave = `slave` ctxKeyForDB gctx.StrKey = `CtxKeyForDB` ctxKeyCatchSQL gctx.StrKey = `CtxKeyCatchSQL` ctxKeyInternalProducedSQL gctx.StrKey = `CtxKeyInternalProducedSQL` // type:[username[:password]@][protocol[(address)]]/dbname[?param1=value1&...¶mN=valueN] linkPattern = `(\w+):([\w\-]*):(.*?)@(\w+?)\((.+?)\)/{0,1}([^\?]*)\?{0,1}(.*)` ) type queryType int const ( queryTypeNormal queryType = 0 queryTypeCount queryType = 1 queryTypeValue queryType = 2 ) type joinOperator string const ( joinOperatorLeft joinOperator = "LEFT" joinOperatorRight joinOperator = "RIGHT" joinOperatorInner joinOperator = "INNER" ) type InsertOption int const ( InsertOptionDefault InsertOption = 0 InsertOptionReplace InsertOption = 1 InsertOptionSave InsertOption = 2 InsertOptionIgnore InsertOption = 3 InsertOperationInsert = "INSERT" InsertOperationReplace = "REPLACE" InsertOperationIgnore = "INSERT IGNORE" InsertOnDuplicateKeyUpdate = "ON DUPLICATE KEY UPDATE" ) const ( SqlTypeBegin = "DB.Begin" SqlTypeTXCommit = "TX.Commit" SqlTypeTXRollback = "TX.Rollback" SqlTypeExecContext = "DB.ExecContext" SqlTypeQueryContext = "DB.QueryContext" SqlTypePrepareContext = "DB.PrepareContext" SqlTypeStmtExecContext = "DB.Statement.ExecContext" SqlTypeStmtQueryContext = "DB.Statement.QueryContext" SqlTypeStmtQueryRowContext = "DB.Statement.QueryRowContext" ) type LocalType string const ( LocalTypeString LocalType = "string" LocalTypeDate LocalType = "date" LocalTypeDatetime LocalType = "datetime" LocalTypeInt LocalType = "int" LocalTypeUint LocalType = "uint" LocalTypeInt64 LocalType = "int64" LocalTypeUint64 LocalType = "uint64" LocalTypeIntSlice LocalType = "[]int" LocalTypeInt64Slice LocalType = "[]int64" LocalTypeUint64Slice LocalType = "[]uint64" LocalTypeInt64Bytes LocalType = "int64-bytes" LocalTypeUint64Bytes LocalType = "uint64-bytes" LocalTypeFloat32 LocalType = "float32" LocalTypeFloat64 LocalType = "float64" LocalTypeBytes LocalType = "[]byte" LocalTypeBool LocalType = "bool" LocalTypeJson LocalType = "json" LocalTypeJsonb LocalType = "jsonb" ) const ( fieldTypeBinary = "binary" fieldTypeVarbinary = "varbinary" fieldTypeBlob = "blob" fieldTypeTinyblob = "tinyblob" fieldTypeMediumblob = "mediumblob" fieldTypeLongblob = "longblob" fieldTypeInt = "int" fieldTypeTinyint = "tinyint" fieldTypeSmallInt = "small_int" fieldTypeSmallint = "smallint" fieldTypeMediumInt = "medium_int" fieldTypeMediumint = "mediumint" fieldTypeSerial = "serial" fieldTypeBigInt = "big_int" fieldTypeBigint = "bigint" fieldTypeBigserial = "bigserial" fieldTypeReal = "real" fieldTypeFloat = "float" fieldTypeDouble = "double" fieldTypeDecimal = "decimal" fieldTypeMoney = "money" fieldTypeNumeric = "numeric" fieldTypeSmallmoney = "smallmoney" fieldTypeBool = "bool" fieldTypeBit = "bit" fieldTypeDate = "date" fieldTypeDatetime = "datetime" fieldTypeTimestamp = "timestamp" fieldTypeTimestampz = "timestamptz" fieldTypeJson = "json" fieldTypeJsonb = "jsonb" ) var ( // instances is the management map for instances. instances = gmap.NewStrAnyMap(true) // driverMap manages all custom registered driver. driverMap = map[string]Driver{} // lastOperatorRegPattern is the regular expression pattern for a string // which has operator at its tail. lastOperatorRegPattern = `[<>=]+\s*$` // regularFieldNameRegPattern is the regular expression pattern for a string // which is a regular field name of table. regularFieldNameRegPattern = `^[\w\.\-]+$` // regularFieldNameWithoutDotRegPattern is similar to regularFieldNameRegPattern but not allows '.'. // Note that, although some databases allow char '.' in the field name, but it here does not allow '.' // in the field name as it conflicts with "db.table.field" pattern in SOME situations. regularFieldNameWithoutDotRegPattern = `^[\w\-]+$` // allDryRun sets dry-run feature for all database connections. // It is commonly used for command options for convenience. allDryRun = false // tableFieldsMap caches the table information retrieved from database. tableFieldsMap = gmap.NewStrAnyMap(true) ) func init() { // allDryRun is initialized from environment or command options. allDryRun = gcmd.GetOptWithEnv(commandEnvKeyForDryRun, false).Bool() } // Register registers custom database driver to gdb. func Register(name string, driver Driver) error { driverMap[name] = newDriverWrapper(driver) return nil } // New creates and returns an ORM object with given configuration node. func New(node ConfigNode) (db DB, err error) { return newDBByConfigNode(&node, "") } // NewByGroup creates and returns an ORM object with global configurations. // The parameter `name` specifies the configuration group name, // which is DefaultGroupName in default. func NewByGroup(group ...string) (db DB, err error) { groupName := configs.group if len(group) > 0 && group[0] != "" { groupName = group[0] } configs.RLock() defer configs.RUnlock() if len(configs.config) < 1 { return nil, gerror.NewCode( gcode.CodeInvalidConfiguration, "database configuration is empty, please set the database configuration before using", ) } if _, ok := configs.config[groupName]; ok { var node *ConfigNode if node, err = getConfigNodeByGroup(groupName, true); err == nil { return newDBByConfigNode(node, groupName) } return nil, err } return nil, gerror.NewCodef( gcode.CodeInvalidConfiguration, `database configuration node "%s" is not found, did you misspell group name "%s" or miss the database configuration?`, groupName, groupName, ) } // newDBByConfigNode creates and returns an ORM object with given configuration node and group name. // // Very Note: // The parameter `node` is used for DB creation, not for underlying connection creation. // So all db type configurations in the same group should be the same. func newDBByConfigNode(node *ConfigNode, group string) (db DB, err error) { if node.Link != "" { node = parseConfigNodeLink(node) } c := &Core{ group: group, debug: gtype.NewBool(), cache: gcache.New(), links: gmap.NewStrAnyMap(true), logger: glog.New(), config: node, dynamicConfig: dynamicConfig{ MaxIdleConnCount: node.MaxIdleConnCount, MaxOpenConnCount: node.MaxOpenConnCount, MaxConnLifeTime: node.MaxConnLifeTime, }, } if v, ok := driverMap[node.Type]; ok { if c.db, err = v.New(c, node); err != nil { return nil, err } return c.db, nil } errorMsg := `cannot find database driver for specified database type "%s"` errorMsg += `, did you misspell type name "%s" or forget importing the database driver? ` errorMsg += `possible reference: https://github.com/gogf/gf/tree/master/contrib/drivers` return nil, gerror.NewCodef(gcode.CodeInvalidConfiguration, errorMsg, node.Type, node.Type) } // Instance returns an instance for DB operations. // The parameter `name` specifies the configuration group name, // which is DefaultGroupName in default. func Instance(name ...string) (db DB, err error) { group := configs.group if len(name) > 0 && name[0] != "" { group = name[0] } v := instances.GetOrSetFuncLock(group, func() interface{} { db, err = NewByGroup(group) return db }) if v != nil { return v.(DB), nil } return } // getConfigNodeByGroup calculates and returns a configuration node of given group. It // calculates the value internally using weight algorithm for load balance. // // The parameter `master` specifies whether retrieving a master node, or else a slave node // if master-slave configured. func getConfigNodeByGroup(group string, master bool) (*ConfigNode, error) { if list, ok := configs.config[group]; ok { // Separates master and slave configuration nodes array. var ( masterList = make(ConfigGroup, 0) slaveList = make(ConfigGroup, 0) ) for i := 0; i < len(list); i++ { if list[i].Role == dbRoleSlave { slaveList = append(slaveList, list[i]) } else { masterList = append(masterList, list[i]) } } if len(masterList) < 1 { return nil, gerror.NewCode( gcode.CodeInvalidConfiguration, "at least one master node configuration's need to make sense", ) } if len(slaveList) < 1 { slaveList = masterList } if master { return getConfigNodeByWeight(masterList), nil } else { return getConfigNodeByWeight(slaveList), nil } } return nil, gerror.NewCodef( gcode.CodeInvalidConfiguration, "empty database configuration for item name '%s'", group, ) } // getConfigNodeByWeight calculates the configuration weights and randomly returns a node. // // Calculation algorithm brief: // 1. If we have 2 nodes, and their weights are both 1, then the weight range is [0, 199]; // 2. Node1 weight range is [0, 99], and node2 weight range is [100, 199], ratio is 1:1; // 3. If the random number is 99, it then chooses and returns node1;. func getConfigNodeByWeight(cg ConfigGroup) *ConfigNode { if len(cg) < 2 { return &cg[0] } var total int for i := 0; i < len(cg); i++ { total += cg[i].Weight * 100 } // If total is 0 means all the nodes have no weight attribute configured. // It then defaults each node's weight attribute to 1. if total == 0 { for i := 0; i < len(cg); i++ { cg[i].Weight = 1 total += cg[i].Weight * 100 } } // Exclude the right border value. var ( min = 0 max = 0 random = grand.N(0, total-1) ) for i := 0; i < len(cg); i++ { max = min + cg[i].Weight*100 if random >= min && random < max { // ==================================================== // Return a COPY of the ConfigNode. // ==================================================== node := ConfigNode{} node = cg[i] return &node } min = max } return nil } // getSqlDb retrieves and returns an underlying database connection object. // The parameter `master` specifies whether retrieves master node connection if // master-slave nodes are configured. func (c *Core) getSqlDb(master bool, schema ...string) (sqlDb *sql.DB, err error) { var ( node *ConfigNode ctx = c.db.GetCtx() ) if c.group != "" { // Load balance. configs.RLock() defer configs.RUnlock() // Value COPY for node. node, err = getConfigNodeByGroup(c.group, master) if err != nil { return nil, err } } else { // Value COPY for node. n := *c.db.GetConfig() node = &n } if node.Charset == "" { node.Charset = defaultCharset } // Changes the schema. nodeSchema := gutil.GetOrDefaultStr(c.schema, schema...) if nodeSchema != "" { node.Name = nodeSchema } // Update the configuration object in internal data. internalData := c.GetInternalCtxDataFromCtx(ctx) if internalData != nil { internalData.ConfigNode = node } // Cache the underlying connection pool object by node. instanceNameByNode := fmt.Sprintf(`%+v`, node) instanceValue := c.links.GetOrSetFuncLock(instanceNameByNode, func() interface{} { if sqlDb, err = c.db.Open(node); err != nil { return nil } if sqlDb == nil { return nil } if c.dynamicConfig.MaxIdleConnCount > 0 { sqlDb.SetMaxIdleConns(c.dynamicConfig.MaxIdleConnCount) } else { sqlDb.SetMaxIdleConns(defaultMaxIdleConnCount) } if c.dynamicConfig.MaxOpenConnCount > 0 { sqlDb.SetMaxOpenConns(c.dynamicConfig.MaxOpenConnCount) } else { sqlDb.SetMaxOpenConns(defaultMaxOpenConnCount) } if c.dynamicConfig.MaxConnLifeTime > 0 { sqlDb.SetConnMaxLifetime(c.dynamicConfig.MaxConnLifeTime) } else { sqlDb.SetConnMaxLifetime(defaultMaxConnLifeTime) } return sqlDb }) if instanceValue != nil && sqlDb == nil { // It reads from instance map. sqlDb = instanceValue.(*sql.DB) } if node.Debug { c.db.SetDebug(node.Debug) } if node.DryRun { c.db.SetDryRun(node.DryRun) } return }