mirror of
https://gitee.com/dromara/mayfly-go
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260 lines
7.6 KiB
Go
260 lines
7.6 KiB
Go
package postgres
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import (
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"context"
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"database/sql"
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"fmt"
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"mayfly-go/internal/db/dbm/dbi"
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"mayfly-go/pkg/errorx"
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"mayfly-go/pkg/utils/anyx"
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"regexp"
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"strings"
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"time"
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)
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const (
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PGSQL_META_FILE = "metasql/pgsql_meta.sql"
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PGSQL_DB_SCHEMAS = "PGSQL_DB_SCHEMAS"
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PGSQL_TABLE_INFO_KEY = "PGSQL_TABLE_INFO"
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PGSQL_INDEX_INFO_KEY = "PGSQL_INDEX_INFO"
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PGSQL_COLUMN_MA_KEY = "PGSQL_COLUMN_MA"
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PGSQL_TABLE_DDL_KEY = "PGSQL_TABLE_DDL_FUNC"
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)
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type PgsqlDialect struct {
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dc *dbi.DbConn
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}
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func (pd *PgsqlDialect) GetDbServer() (*dbi.DbServer, error) {
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_, res, err := pd.dc.Query("SHOW server_version")
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if err != nil {
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return nil, err
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}
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ds := &dbi.DbServer{
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Version: anyx.ConvString(res[0]["server_version"]),
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}
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return ds, nil
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}
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func (pd *PgsqlDialect) GetDbNames() ([]string, error) {
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_, res, err := pd.dc.Query("SELECT datname AS dbname FROM pg_database WHERE datistemplate = false AND has_database_privilege(datname, 'CONNECT')")
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if err != nil {
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return nil, err
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}
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databases := make([]string, 0)
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for _, re := range res {
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databases = append(databases, anyx.ConvString(re["dbname"]))
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}
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return databases, nil
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}
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// 获取表基础元信息, 如表名等
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func (pd *PgsqlDialect) GetTables() ([]dbi.Table, error) {
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_, res, err := pd.dc.Query(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_TABLE_INFO_KEY))
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if err != nil {
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return nil, err
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}
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tables := make([]dbi.Table, 0)
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for _, re := range res {
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tables = append(tables, dbi.Table{
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TableName: re["tableName"].(string),
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TableComment: anyx.ConvString(re["tableComment"]),
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CreateTime: anyx.ConvString(re["createTime"]),
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TableRows: anyx.ConvInt(re["tableRows"]),
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DataLength: anyx.ConvInt64(re["dataLength"]),
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IndexLength: anyx.ConvInt64(re["indexLength"]),
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})
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}
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return tables, nil
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}
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// 获取列元信息, 如列名等
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func (pd *PgsqlDialect) GetColumns(tableNames ...string) ([]dbi.Column, error) {
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tableName := ""
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for i := 0; i < len(tableNames); i++ {
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if i != 0 {
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tableName = tableName + ", "
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}
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tableName = tableName + "'" + tableNames[i] + "'"
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}
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_, res, err := pd.dc.Query(fmt.Sprintf(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_COLUMN_MA_KEY), tableName))
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if err != nil {
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return nil, err
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}
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columns := make([]dbi.Column, 0)
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for _, re := range res {
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columns = append(columns, dbi.Column{
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TableName: re["tableName"].(string),
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ColumnName: re["columnName"].(string),
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ColumnType: anyx.ConvString(re["columnType"]),
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ColumnComment: anyx.ConvString(re["columnComment"]),
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Nullable: anyx.ConvString(re["nullable"]),
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ColumnKey: anyx.ConvString(re["columnKey"]),
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ColumnDefault: anyx.ConvString(re["columnDefault"]),
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NumScale: anyx.ConvString(re["numScale"]),
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})
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}
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return columns, nil
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}
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func (pd *PgsqlDialect) GetPrimaryKey(tablename string) (string, error) {
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columns, err := pd.GetColumns(tablename)
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if err != nil {
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return "", err
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}
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if len(columns) == 0 {
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return "", errorx.NewBiz("[%s] 表不存在", tablename)
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}
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for _, v := range columns {
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if v.ColumnKey == "PRI" {
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return v.ColumnName, nil
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}
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}
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return columns[0].ColumnName, nil
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}
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// 获取表索引信息
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func (pd *PgsqlDialect) GetTableIndex(tableName string) ([]dbi.Index, error) {
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_, res, err := pd.dc.Query(fmt.Sprintf(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_INDEX_INFO_KEY), tableName))
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if err != nil {
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return nil, err
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}
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indexs := make([]dbi.Index, 0)
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for _, re := range res {
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indexs = append(indexs, dbi.Index{
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IndexName: re["indexName"].(string),
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ColumnName: anyx.ConvString(re["columnName"]),
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IndexType: anyx.ConvString(re["IndexType"]),
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IndexComment: anyx.ConvString(re["indexComment"]),
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NonUnique: anyx.ConvInt(re["nonUnique"]),
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SeqInIndex: anyx.ConvInt(re["seqInIndex"]),
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})
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}
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// 把查询结果以索引名分组，索引字段以逗号连接
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result := make([]dbi.Index, 0)
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key := ""
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for _, v := range indexs {
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// 当前的索引名
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in := v.IndexName
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if key == in {
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// 索引字段已根据名称和顺序排序，故取最后一个即可
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i := len(result) - 1
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// 同索引字段以逗号连接
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result[i].ColumnName = result[i].ColumnName + "," + v.ColumnName
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} else {
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key = in
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result = append(result, v)
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}
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}
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return result, nil
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}
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// 获取建表ddl
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func (pd *PgsqlDialect) GetTableDDL(tableName string) (string, error) {
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_, err := pd.dc.Exec(dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_TABLE_DDL_KEY))
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if err != nil {
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return "", err
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}
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_, schemaRes, _ := pd.dc.Query("select current_schema() as schema")
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schemaName := schemaRes[0]["schema"].(string)
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ddlSql := fmt.Sprintf("select showcreatetable('%s','%s') as sql", schemaName, tableName)
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_, res, err := pd.dc.Query(ddlSql)
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if err != nil {
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return "", err
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}
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return res[0]["sql"].(string), nil
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}
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func (pd *PgsqlDialect) WalkTableRecord(tableName string, walkFn dbi.WalkQueryRowsFunc) error {
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return pd.dc.WalkQueryRows(context.Background(), fmt.Sprintf("SELECT * FROM %s", tableName), walkFn)
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}
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// 获取pgsql当前连接的库可访问的schemaNames
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func (pd *PgsqlDialect) GetSchemas() ([]string, error) {
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sql := dbi.GetLocalSql(PGSQL_META_FILE, PGSQL_DB_SCHEMAS)
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_, res, err := pd.dc.Query(sql)
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if err != nil {
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return nil, err
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}
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schemaNames := make([]string, 0)
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for _, re := range res {
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schemaNames = append(schemaNames, anyx.ConvString(re["schemaName"]))
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}
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return schemaNames, nil
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}
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// GetDbProgram 获取数据库程序模块，用于数据库备份与恢复
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func (pd *PgsqlDialect) GetDbProgram() dbi.DbProgram {
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panic("implement me")
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}
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func (pd *PgsqlDialect) GetDataType(dbColumnType string) dbi.DataType {
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if regexp.MustCompile(`(?i)int|double|float|number|decimal|byte|bit`).MatchString(dbColumnType) {
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return dbi.DataTypeNumber
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}
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// 日期时间类型
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if regexp.MustCompile(`(?i)datetime|timestamp`).MatchString(dbColumnType) {
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return dbi.DataTypeDateTime
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}
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// 日期类型
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if regexp.MustCompile(`(?i)date`).MatchString(dbColumnType) {
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return dbi.DataTypeDate
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}
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// 时间类型
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if regexp.MustCompile(`(?i)time`).MatchString(dbColumnType) {
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return dbi.DataTypeTime
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}
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return dbi.DataTypeString
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}
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func (pd *PgsqlDialect) BatchInsert(tx *sql.Tx, tableName string, columns []string, values [][]any) (int64, error) {
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// 执行批量insert sql，跟mysql一样 pg或高斯支持批量insert语法
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// insert into table_name (column1, column2, ...) values (value1, value2, ...), (value1, value2, ...), ...
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// 把二维数组转为一维数组
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var args []any
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for _, v := range values {
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args = append(args, v...)
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}
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// 构建占位符字符串 "($1, $2, $3), ($4, $5, $6), ..." 用于指定参数
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var placeholders []string
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for i := 0; i < len(args); i += len(columns) {
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var placeholder []string
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for j := 0; j < len(columns); j++ {
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placeholder = append(placeholder, fmt.Sprintf("$%d", i+j+1))
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}
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placeholders = append(placeholders, "("+strings.Join(placeholder, ", ")+")")
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}
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sqlStr := fmt.Sprintf("insert into %s (%s) values %s", pd.dc.Info.Type.QuoteIdentifier(tableName), strings.Join(columns, ","), strings.Join(placeholders, ", "))
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// 执行批量insert sql
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return pd.dc.TxExec(tx, sqlStr, args...)
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}
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func (pd *PgsqlDialect) FormatStrData(dbColumnValue string, dataType dbi.DataType) string {
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switch dataType {
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case dbi.DataTypeDateTime: // "2024-01-02T22:16:28.545377+08:00"
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res, _ := time.Parse(time.RFC3339, dbColumnValue)
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return res.Format(time.DateTime)
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case dbi.DataTypeDate: // "2024-01-02T00:00:00Z"
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res, _ := time.Parse(time.RFC3339, dbColumnValue)
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return res.Format(time.DateOnly)
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case dbi.DataTypeTime: // "0000-01-01T22:16:28.545075+08:00"
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res, _ := time.Parse(time.RFC3339, dbColumnValue)
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return res.Format(time.TimeOnly)
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}
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return dbColumnValue
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}
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