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clickhouse-database-export

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zgq
2024-03-06 20:41:48 +08:00
parent 02257553e4
commit 48bbf6ca83
1 changed files with 66 additions and 2 deletions
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chat2db-server/chat2db-plugins/chat2db-clickhouse/src/main/java/ai/chat2db/plugin/clickhouse/ClickHouseDBManage.java
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@ -1,14 +1,78 @@
package ai.chat2db.plugin.clickhouse;
import java.sql.Connection;
import ai.chat2db.spi.DBManage;
import ai.chat2db.spi.jdbc.DefaultDBManage;
import ai.chat2db.spi.sql.ConnectInfo;
import ai.chat2db.spi.sql.SQLExecutor;
import org.apache.commons.lang3.StringUtils;
import java.sql.*;
import java.util.Objects;
public class ClickHouseDBManage extends DefaultDBManage implements DBManage {
@Override
public String exportDatabase(Connection connection, String databaseName, String schemaName, boolean containData) throws SQLException {
StringBuilder sqlBuilder = new StringBuilder();
exportTablesOrViewsOrDictionaries(connection, sqlBuilder, databaseName, containData);
exportFunctions(connection, sqlBuilder);
return sqlBuilder.toString();
}
private void exportFunctions(Connection connection, StringBuilder sqlBuilder) throws SQLException {
try(Statement statement = connection.createStatement();ResultSet resultSet = statement.executeQuery("SELECT name,create_query from system.functions where origin='SQLUserDefined'")){
while (resultSet.next()) {
sqlBuilder.append("DROP FUNCTION IF EXISTS ").append(resultSet.getString(1)).append(";\n");
sqlBuilder.append(resultSet.getString(2)).append(";\n");
}
}
}
private void exportTablesOrViewsOrDictionaries(Connection connection, StringBuilder sqlBuilder, String databaseName, boolean containData) throws SQLException {
try (Statement statement = connection.createStatement(); ResultSet resultSet = statement.executeQuery("SELECT create_table_query, has_own_data,engine,name from system.`tables` WHERE `database`='" + databaseName + "'")) {
while (resultSet.next()) {
String ddl = resultSet.getString(1);
boolean dataFlag = resultSet.getInt(2) == 1;
String tableType = resultSet.getString(3);
String tableOrViewName = resultSet.getString(4);
if (Objects.equals("View", tableType)) {
sqlBuilder.append("DROP VIEW IF EXISTS ").append(databaseName).append(".").append(tableOrViewName).append(";\n").append(ddl).append(";");
} else if (Objects.equals("Dictionary", tableType)) {
sqlBuilder.append("DROP DICTIONARY IF EXISTS ").append(databaseName).append(".").append(tableOrViewName).append(";\n").append(ddl).append(";");
} else {
sqlBuilder.append("DROP TABLE IF EXISTS ").append(databaseName).append(".").append(tableOrViewName).append(";\n").append(ddl).append(";");
if (containData && dataFlag) {
exportTableData(connection, tableOrViewName, sqlBuilder);
}
}
}
}
}
private void exportTableData(Connection connection, String tableName, StringBuilder sqlBuilder) throws SQLException {
StringBuilder insertSql = new StringBuilder();
try (Statement statement = connection.createStatement(); ResultSet resultSet = statement.executeQuery("select * from " + tableName)) {
ResultSetMetaData metaData = resultSet.getMetaData();
while (resultSet.next()) {
insertSql.append("INSERT INTO ").append(tableName).append(" VALUES (");
for (int i = 1; i <= metaData.getColumnCount(); i++) {
String value = resultSet.getString(i);
if (Objects.isNull(value)) {
insertSql.append("NULL");
} else {
insertSql.append("'").append(value).append("'");
}
if (i < metaData.getColumnCount()) {
insertSql.append(", ");
}
}
insertSql.append(");\n");
}
insertSql.append("\n");
}
sqlBuilder.append(insertSql);
}
@Override
public Connection getConnection(ConnectInfo connectInfo) {